JSTL stringFormat...set to a VAR? -

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hello have this:

  <c:when test='${results.fieldnames[rowstatus.index] == "nsn"}'>                 <fmt:formatnumber value="${cell}" pattern="${commas_with_no_decimal_pattern}" var="tarr"/>                 </c:when>

where im setting formatted # var="tarr". want use string formatter , set var="tarr". know how set this:

<ctl:stringformat format="@@@@-@@-@@@-@@@@">${dispval}</ctl:stringformat>

how can set formatted string var?

had set var property in ctl:stringformat tld


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